Oki B4100 - Manual (Page 387)

40055101TH Rev.4 387 /
X2
32.768 KHz
RAM2
FLS
IC3
Flash
memory
512 KB
RAM1
DRAM
512 KB
Real time
clock IC
Back up
battery
circuit
Mask ROM
512 KB
A01 to A18
MDMRD-N/
MDWR-N
RTCCS
AD00 to AD15
+24V
F12VON
RP/PP
circuit
MASK
CASH-N/CASL-N/
RASI-N
RD-N/WRL-N
Figure A3.1.3 Block Diagram of DRAM/Flash Memory/Mask ROM and Real-time Clock IC